Dance in buff -- desperate man gets fit (8)
I believe the answer is:
fandango
'dance' is the definition.
(type of dance)
'buff desperate man gets fit' is the wordplay.
I cannot quite see how this works, but
'buff' could be 'fan' (synonyms) and 'fan' is found within the answer.
'man' could be 'dan' and 'dan' is found in the answer.
'fit' could be 'go' (going is a kind of fitting) and 'go' is found within the answer.
No letters remain.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for fandango that I've seen before include "Dance performed with castanets" , "Old Spanish dance in triple time" , "Lively Spanish dance" , "Spanish Steps" , "Spanish 2 Down" .)