Woolly from one adjacent catching a cold (7)
I believe the answer is:
inexact
'woolly' is the definition.
(I've seen this before)
'one adjacent catching a cold' is the wordplay.
'one' becomes 'i' (Roman numeral).
'adjacent' becomes 'next' ('next' can be a synonym of 'adjacent').
'catching' is an insertion indicator.
'a cold' becomes 'ac' (I've seen this in other clues**).
'next' enclosing 'ac' is 'nexact'.
'i'+'nexact'='INEXACT'
'from' is the link.
(Other definitions for inexact that I've seen before include "Vague" , "Not entirely accurate" , "Woolly" , "estimated?" , "Not precise, approximate" .)