Not following rules? PM Sunak silent or worried? (15)
I believe the answer is:
unsportsmanlike
'not following rules?' is the definition.
(unsportsmanlike can mean cheating)
'pm sunak silent or worried?' is the wordplay.
'worried?' indicates anagramming the letters (worry can mean to interfere with or disturb).
'pm'+'sunak'+'silent'+'or'='pmsunaksilentor'
'pmsunaksilentor' is an anagram of 'UNSPORTSMANLIKE'.
(Other definitions for unsportsmanlike that I've seen before include "Dirty" , "Like going for a trip when playing football" , "Sneaky" , "unfair" , "Not cricket" .)