Beseech other guards to reflect (4)
I believe the answer is:
echo
'reflect' is the definition.
(I've seen this in another clue)
'beseech other guards' is the wordplay.
'guards' indicates the answer is hidden within the clue.
'ECHO' can be found hidden inside 'beseech other'.
'to' is the link.
(Other definitions for echo that I've seen before include "Repeated sound" , "Marked by heat" , "Bounced sound" , "Return of sound waves" , "repercussion" .)