Robust, carrying two ducks, daughter was easy to spot (5,3)
I believe the answer is:
stood out
'easy to spot' is the definition.
I can't tell whether this defines the answer.
'robust carrying two ducks daughter' is the wordplay.
'robust' becomes 'stout' (similar in meaning).
'carrying' is an insertion indicator.
'two ducks' becomes 'oo'.
'daughter' becomes 'd' (genealogical abbreviation).
'oo'+'d'='ood'
'stout' enclosing 'ood' is 'STOOD OUT'.
'was' is the link.
Can you help me to learn more?
(Other definitions for stood out that I've seen before include "Was proud" , "very noticeable" , "Offered resistance - didn''t go unnoticed" , "Was conspicuous" .)