Stake stuck into companion by unnamed man in drama (7)
I believe the answer is:
macbeth
'drama' is the definition.
(play by Shakespeare)
'stake stuck into companion by unnamed man' is the wordplay.
'stake' becomes 'bet' (synonyms).
'stuck into' indicates putting letters inside.
'companion' becomes 'ch' (Companion of Honour).
'by' means one lot of letters go next to another.
'unnamed man' becomes 'ma' (I can't explain this - if you can you should give a lot more credence to this answer).
'bet' inserted within 'ch' is 'cbeth'.
'cbeth' after 'ma' is 'MACBETH'.
'in' is the link.
(Other definitions for macbeth that I've seen before include "Shakespearean play" , "dramatic role" , "bloody drama" , "Ill-fated Shakespearean king" , "from 6 & 12 VERDI & SHAKESPEARE] ?" .)