Went towards - it was custom built (4,3)

I believe the answer is:

made for

I'm a little stuck... Click here to teach me more about this clue!

'went towards it was custom' is the definition.
I can't tell whether this definition defines the answer.

'built' is the wordplay.
I cannot really see how this works, but
'built' could be 'made' ('make' can be a synonym of 'build') and 'made' is located in the answer.
The remaining letters 'for' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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