Buddy boiling, working out for this? (12)

I believe the answer is:

bodybuilding

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'this?' is the definition.
The definition suggests a singular noun which matches the answer.

'buddy boiling working out' is the wordplay.
'working out' indicates an anagram (an anagram must be worked out from the letters).
'buddy'+'boiling'='buddyboiling'
'buddyboiling' anagrammed gives 'BODYBUILDING'.

'for' acts as a link.

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I've seen this clue in The Times.

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