Observe daughter or other offspring (4)
I believe the answer is:
seed
'other offspring' is the definition.
'seed' can be an answer for 'offspring' (I've seen this in another clue). I'm unsure of the 'other' bit.
'observe daughter' is the wordplay.
'observe' becomes 'see' (I've seen this before).
'daughter' becomes 'd' (genealogical abbreviation).
'see'+'d'='SEED'
'or' is the link.
(Other definitions for seed that I've seen before include "It can develop into a plant" , "Local escorted" , "Initiate the growth of" , "one of the top players" , "Beginning; sow (land)" .)