Like wizened old men in the fourth row (5)
I believe the answer is:
lined
'like wizened old men in' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?
'fourth row' is the wordplay.
I cannot really see how this works, but
'row' could be 'line' (as in a row of things) and 'line' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Other definitions for lined that I've seen before include "displaying signs of age" , "given protection" , "Went along with" , "Covered inner surface" , "Creased" .)