General went back with prisoner, initially, to ex-PM of the United Kingdom (4)
I believe the answer is:
peel
'ex-pm of the united kingdom' is the definition.
I can't tell whether this definition defines the answer.
'general went back with prisoner initially' is the wordplay.
'general' becomes 'lee' (Robert E. Lee - US revolutionary commander).
'went back' says the letters should be written in reverse.
'with' is a charade indicator (letters next to each other).
'initially' says to take the initial letters.
The initial letter of 'prisoner' is 'p'.
'lee' backwards is 'eel'.
'eel' after 'p' is 'PEEL'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for peel that I've seen before include "A PM; a fortified tower" , "island" , "Rind of fruit" , "Remove the rind" , "Strip off -- Manx port" .)