More wary of large stranger (7)
I believe the answer is:
leerier
'more wary' is the definition.
(leery can mean wary or cautious)
'large stranger' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'stranger' becomes 'eerier' (eerie means odd or strange).
'l'+'eerier'='LEERIER'
'of' is the link.
(Other definitions for leerier that I've seen before include "more cunning" , "more wary" .)