Adorable saint swallowing very little (5)
I believe the answer is:
sweet
'adorable' is the definition.
(thesaurus)
'saint swallowing very little' is the wordplay.
'saint' becomes 'st' (abbreviation).
'swallowing' is an insertion indicator.
'very little' becomes 'wee' (I've seen this in another clue).
'st' placed around 'wee' is 'SWEET'.
(Other definitions for sweet that I've seen before include "Kind" , "Afters" , "winning" , "Toffee, e.g." , "Melodious, not bitter" .)