Wander off, ditching right guy (4)
I believe the answer is:
stay
'guy' is the definition.
(guy can mean to steady or stay with rope)
'wander off ditching right' is the wordplay.
'wander off' becomes 'stray' (I've seen this before).
'ditching' indicates named letters should be taken away.
'right' becomes 'r' (common abbreviation).
'stray' with 'r' taken out is 'STAY'.
(Other definitions for stay that I've seen before include "Sojourn" , "Thin strip used to stiffen a garment" , "remain in the same place" , "guy giving > support" , "Support, delay" .)