〜しては is this a grammar pattern?


I was trying to translate this sentence:

> 僕はアルバイト **しては** レコードばかり買っていたから、一日半働けばLP一枚買えるな、と思って働いていた。

I think I get the overall meaning as: Because I spent all my wages on records
I went to work thinking "If I work a day and a half I can buy an LP."

But I'm confused by the アルバイトしては

What's going on with the grammar here?




I think it might be sense 3 of this [Daijirin
definition](http://dic.yahoo.co.jp/dsearch?enc=UTF-8&p=%E3%81%A6%E3%81%AF&dtype=0&dname=0ss&stype=0&index=113492300000&pagenum=1),
which defines it as `…するときはいつも…する`, which I think can be defined as "whenever
(you) do ..., (you) do ...":

> 僕はアルバイトしてはレコードばかり買っていたから、一日半働けばLP一枚買えるな、と思って働いていた。  
>  Whenever I was working part-time, I was solely buying records, so I was
> working thinking that if I work for a day and a half, I can buy an LP.

For example, from
[Daijisen](http://dic.yahoo.co.jp/dsearch?enc=UTF-8&p=%E3%81%A6%E3%81%AF&dtype=0&dname=0na&stype=0&index=12757600&pagenum=1):

> 幼い頃は電車を見ては喜んでいた。  
>  When I was young, whenever I saw a train I was delighted.

I think this is distinct from another similar usage of `～ては` (sense 4 at
[Daijirin](http://dic.yahoo.co.jp/dsearch?enc=UTF-8&p=%E3%81%A6%E3%81%AF&dtype=0&dname=0ss&stype=0&index=113492300000&pagenum=1)),
which is defined as two actions etc which make a pair and are repeated, for
example:

> ころんでは起き、ころんでは起きて…  
>  (I) alternate between falling down and getting up, falling down and getting
> up...

**Edit:** Reverted the definition to an earlier version based on suggestions
in the comments.

