Trunk - character opening it roughly (5)

I believe the answer is:

torso

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'trunk' is the definition.
(synonyms)

'it roughly' is the wordplay.
'it' becomes 't' (abbreviation. e.g. in 'tis).
'roughly' becomes 'orso' (synonyms).
't'+'orso'='TORSO'

'character opening' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for torso that I've seen before include "unfinished work" , "Body's trunk" , "Roost (anag)" , "Roots (anag)" , "Main part of human body" .)

I've seen this clue in The Independent.

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