Peer in real trouble (4)
I believe the answer is:
earl
'peer' is the definition.
(earl is a kind of peer)
'real trouble' is the wordplay.
'trouble' indicates anagramming the letters.
'real' anagrammed gives 'EARL'.
'in' is the link.
(Other definitions for earl that I've seen before include "... Grey, fragrant Oriental tea" , "Rank below marquess" , "Aristocrat ranking between marquis and viscount" , "-- Grey, PM 1830-34" , "A lord like Lear" .)