Possibly leapt into the fold (5)
I believe the answer is:
pleat
'the fold' is the definition.
(pleat is a kind of fold)
'possibly leapt' is the wordplay.
'possibly' indicates an anagram.
'leapt' anagrammed gives 'PLEAT'.
'into' acts as a link.
(Other definitions for pleat that I've seen before include "Fold in clothing" , "work on skirt?" , "Type of fold in fabric" , "Fold in material" , "Tuck" .)