Crossword Genius

Decided to buy and to give up gallivanting (6,4)

Ross

I believe the answer is:

settle down

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'give up gallivanting' is the definition.
I can't judge whether this defines the answer.

'decided to buy and' is the wordplay.
'decided' becomes 'settled' ('settle' can be a synonym of 'decide').
'to buy' becomes 'ow' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' becomes 'n' (common abbreviation for 'and').
'settled'+'ow'+'n'='SETTLE DOWN'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for settle down that I've seen before include "put down roots" , "Become quiet and orderly" .)

I've seen this clue in the Evening Standard.
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