Walked and finally sat on perch (4)
I believe the answer is:
trod
'walked' is the definition.
(treading is a kind of walking)
'finally sat on perch' is the wordplay.
'finally' says to take the final letters.
'on' means one lot of letters go next to another.
'perch' becomes 'rod' ('rod' can be a synonym of 'perch').
The last letter of 'sat' is 't'.
't'+'rod'='TROD'
'and' is the link.
(Other definitions for trod that I've seen before include "Trudged, stepped" , "Pressed (grapes) by foot" , "Walked (on something)" , "Walked heavily, put foot down" , "Trampled" .)