Resembling Sir Liam after reconstruction (7)
I believe the answer is:
similar
'resembling' is the definition.
(I've seen this in another clue)
'sir liam after reconstruction' is the wordplay.
'after reconstruction' is an anagram indicator.
'sir'+'liam'='sirliam'
'sirliam' anagrammed gives 'SIMILAR'.
(Other definitions for similar that I've seen before include "Comparable" , "Alike, resembling" , "Having a close resemblance to" , "Resembling, like" , "Appearing the same" .)