Top Labour and increasingly rattled Tory leaders keeping quiet (10)
I believe the answer is:
sweatshirt
'top' is the definition.
(I've seen this before)
'labour and increasingly rattled tory leaders keeping quiet' is the wordplay.
I cannot really understand how this works, but
'labour' could be 'sweat' (sweat is a kind of labour) and 'sweat' is present in the answer.
'tory' could be 'r' (abbreviation for right) and 'r' is present in the answer.
'quiet' could be 'sh' ('sh' is used to tell someone to be quiet) and 'sh' is present in the answer.
The remaining letters 'it' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sweatshirt that I've seen before include "leisurewear" , "Long-sleeved top worn by athletes" , "casual gear" , "Long-sleeved, knitted cotton sweater" .)