Beam, seeing Queen following (6)
I believe the answer is:
rafter
'beam' is the definition.
(rafter is a kind of beam)
'queen following' is the wordplay.
'queen' becomes 'r' (r is abbreviation regina. e.g. in ER ).
'following' becomes 'after' (I've seen this before).
'r'+'after'='RAFTER'
'seeing' acts as a link.
(Other definitions for rafter that I've seen before include "support" , "Sloping beam that supports the roof" , "Roofing beam" , "See retired Aussie tennis player" , "Strong wooden beam for roof" .)