Assimilate some catering establishments (6)
I believe the answer is:
ingest
'assimilate' is the definition.
(synonyms)
'some catering establishments' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'INGEST' is hidden in the letters of 'catering establishments'.
(Other definitions for ingest that I've seen before include "take in, eat" , "Absorb mentally" , "How to take courses" , "Take nourishment into the body" , "Gets in (anag.)" .)