Which person is on a command to pull up? (4)
I believe the answer is:
whoa
'command to pull up?' is the definition.
I can't tell whether this defines the answer.
'which person is on a' is the wordplay.
'which person' becomes 'who' (I've seen this in another clue).
'is on' is a charade indicator (letters next to each other).
'who'+'a'='WHOA'
Can you help me to learn more?
(Other definitions for whoa that I've seen before include "Command for horse to slow or stop" , "Cry for horses to stop" , "Danger" , "Hold your horses!" , "Call to stop" .)