Facts about lad’s tie (7)
I believe the answer is:
details
'facts' is the definition.
(I know this)
'about lad's tie' is the wordplay.
'about' indicates an anagram.
'lads'+'tie'='ladstie'
'ladstie' with letters rearranged gives 'DETAILS'.
(Other definitions for details that I've seen before include "Small features" , "Particulars, small parts" , "Minutiae" .)