Please wait a moment for what groom may do? (4,4,6)
I believe the answer is:
hold your horses
'please' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'wait a moment for what groom may do?' is the wordplay.
I cannot really see how this works, but
'wait' could be 'hold' (synonyms) and 'hold' is found in the answer.
'moment' could be 's' and 's' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hold your horses that I've seen before include "The groom may" , "wait a moment" , "Not so fast" .)