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' is an anagram indicator.
'leapt' anagrammed gives 'PLEAT'.
'into' is the 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" .)