Hand eggs one cracks to Head of Nutrition (7)
I believe the answer is:
ovation
'hand' is the definition.
(both can mean applause)
'eggs one cracks to head of nutrition' is the wordplay.
'eggs' becomes 'ova' (term for egg cells).
'one' becomes 'i' (Roman numeral).
'cracks' is an insertion indicator (crack their way in).
'head of' says to take the initial letters.
The first letter of 'nutrition' is 'n'.
'i' inserted into 'to' is 'tio'.
'ova'+'tio'+'n'='OVATION'
(Other definitions for ovation that I've seen before include "Enthusiastic applause, perhaps standing" , "Enthusiastic and loud applause (sometimes standing)" , "Great outburst of applause" , "Great reception" , "Sustained applause (may be standing)" .)