Squashed tomato with pole on seat (7)
I believe the answer is:
ottoman
'seat' is the definition.
(ottoman is a kind of seat)
'squashed tomato with pole' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'tomato' is 'ottoma' which is present in the answer.
'pole' could be 'n' (abbreviation for North, as in North Pole) and 'n' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'on' is the link.
Can you help me to learn more?
(Other definitions for ottoman that I've seen before include "Couch for a Turk" , "that lacks arms and backing" , "Description of empire" , "Turkish dynasty and cushioned stool" , "Turkish (hist.)" .)