Nag and daughter produce small creature (6)
I believe the answer is:
shrewd
'nag and daughter produce small creature' is the definition.
I can't tell whether this defines the answer.
'nag and daughter' is the wordplay.
'nag' becomes 'shrew' (I've seen this in another clue).
'and' says to put letters next to each other.
'daughter' becomes 'd' (genealogical abbreviation).
'shrew'+'d'='SHREWD'
Can you help me to learn more?
(Other definitions for shrewd that I've seen before include "Canny and astute" , "Canny and with sound judgement" , "keen" , "Canny and calculating" , "Sharp-witted" .)