Perfect round will get you exhausted (4-4)

I believe the answer is:

dead-beat

'exhausted' is the definition.
(I've seen this before)

'perfect round' is the wordplay.
'perfect' becomes 'dead' (eg in phrases like 'dead centre').
'round' becomes 'beat' (synonyms).
'dead'+'beat'='DEAD-BEAT'

'will get you' acts as a link.

I've seen this clue in The Telegraph.

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