Vegetable in painting perhaps seen on tip of Irish clog (9)
I believe the answer is:
artichoke
'vegetable' is the definition.
(type of vegetable)
'painting perhaps seen on tip of irish clog' is the wordplay.
'painting perhaps' becomes 'art' (painting is a kind of art).
'seen on' says to put letters next to each other.
'tip of' indicates taking the first letters.
'clog' becomes 'choke' (synonyms).
The first letter of 'irish' is 'i'.
'art'+'i'+'choke'='ARTICHOKE'
'in' is the link.
(Other definitions for artichoke that I've seen before include "vegetable's served?" , "Vegetable could give you a thicko ear" , "Jerusalem or globe?" , "Edible thistle-like bud" , "Plant with edible flower heads" .)