Imbalance of my tyres man briefly realigned (9)
I believe the answer is:
asymmetry
'imbalance' is the definition.
('asymmetry' can be a synonym of 'imbalance')
'my tyres man briefly realigned' is the wordplay.
'briefly' means to remove the last letter.
'realigned' indicates anagramming the letters.
'my'+'tyres'+'man'='mytyresman'
'mytyresman' with its final letter taken off is 'mytyresma'.
'mytyresma' is an anagram of 'ASYMMETRY'.
'of' acts as a link.
(Other definitions for asymmetry that I've seen before include "Lack of similarity between two parts or halves" , "with different faces" , "Irregularity" , "displays a lack of regularity" .)