Nanny’s tender love, coming in to collect daughter (8)
I believe the answer is:
goatherd
'nanny's tender' is the definition.
(a goatherd might tend to nanny goats)
'love coming in to collect daughter' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'coming in to' means one lot of letters goes inside another.
'collect' becomes 'gather' (synonyms).
'daughter' becomes 'd' (genealogical abbreviation).
'o' placed inside 'gather' is 'goather'.
'goather'+'d'='GOATHERD'
(Other definitions for goatherd that I've seen before include "Great hod (anag.)" , "one looking after kids" .)