Troop leaders have plenty of underlings to walk all over (7)
I believe the answer is:
trample
'to walk all over' is the definition.
(I've seen this in another clue)
'troop leaders have plenty of' is the wordplay.
'troop leaders' becomes 'tr' (I am not sure about this - if you are sure you should believe this answer much more).
'have' means one lot of letters go next to another.
'plenty of' becomes 'ample' (I've seen this in another clue).
'tr'+'ample'='TRAMPLE'
'underlings' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for trample that I've seen before include "Traipse over" , "Encroach with violence" , "Walk heavily or roughly" , "Tread heavily" , "Crush underfoot" .)