Bump into muscly entomologist on vacation (6)
I believe the answer is:
buffet
'bump' is the definition.
(thesaurus)
'muscly entomologist on vacation' is the wordplay.
'muscly' becomes 'buff' (I've seen this in another clue).
'on vacation' says to hollow out the word (remove centre letters) (after the inside letters have vacated the word).
'entomologist' with its middle removed is 'et'.
'buff'+'et'='BUFFET'
'into' acts as a link.
(Other definitions for buffet that I've seen before include "Refreshment bar" , "Self-service meal; strike" , "self-service place" , "Blow - self-service food" , "Refreshment counter - slap" .)