Occasionally funny caller (relatively speaking!) (5)
I believe the answer is:
uncle
'relatively speaking' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'occasionally funny caller' is the wordplay.
'occasionally' means one should take alternating letters.
'funny'+'caller'='funnycaller'
The alternate letters of 'funnycaller' are 'UNCLE'.
Can you help me to learn more?
(Other definitions for uncle that I've seen before include "Dad's brother" , "A parent's brother" , "Pawnbroker's nickname" , "Male relative - pawnbroker" , "Sam, perhaps" .)