Detached from a lavatory by force (5)
I believe the answer is:
aloof
'detached' is the definition.
(I've seen this before)
'a lavatory by force' is the wordplay.
'lavatory' becomes 'loo' (loo is a kind of lavatory).
'by' means one lot of letters go next to another.
'force' becomes 'f' (symbol used in Physics e.g. f=ma).
'a'+'loo'+'f'='ALOOF'
'from' acts as a link.
(Other definitions for aloof that I've seen before include "Socially detached" , "Coldly distant" , "apart from all else" , "Cool and remote, even unfriendly" , "Unfriendly or distant like a fool" .)