Officer means to be heard, one who may tickle others (5)
I believe the answer is:
comic
'one who may tickle others' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'officer means to be heard' is the wordplay.
'officer' becomes 'co' (Commanding Officer abbreviation).
'means to be heard' becomes 'mic' (microphone).
'co'+'mic'='COMIC'
Can you help me to learn more?
(Other definitions for comic that I've seen before include "Amusing person" , "Priceless" , "Raising mirth" , "Funny, laughable" , "Raising a laugh" .)