Middle of match with roughly unfinished form (5)

I believe the answer is:

torso

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'unfinished form' is the definition.
'torso' can be an answer for 'form' (thesaurus). I am unsure of the 'unfinished' bit.

'middle of match with roughly' is the wordplay.
'middle of' says to take the centre.
'with' means one lot of letters go next to another.
'roughly' becomes 'or so' (synonyms).
The middle of 'match' is 't'.
't'+'orso'='TORSO'

Can you help me to learn more?

(Other definitions for torso that I've seen before include "Chest" , "Roost (anag)" , "Roots (anag)" , "Roots out in trunk of the body" , "Body, minus its head and limbs" .)

I've seen this clue in The Telegraph.

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