Nudge perhaps about person caring for children (8)
I believe the answer is:
reminder
'nudge perhaps' is the definition.
(a nudge might remind you about something)
'about person caring for children' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'person caring for children' becomes 'minder' (childminder).
're'+'minder'='REMINDER'
(Other definitions for reminder that I've seen before include "Aide-mmoire" , "Knot in handkerchief?" , "note" , "Hint, suggestion" , "Memory-jogger" .)