Eggs turn into cheers (7)
I believe the answer is:
ovation
'cheers' is the definition.
(thesaurus)
'eggs turn into' is the wordplay.
'eggs' becomes 'ova' (term for egg cells).
'turn' is an anagram indicator.
'into' with letters rearranged gives 'tion'.
'ova'+'tion'='OVATION'
(Other definitions for ovation that I've seen before include "One's often standing" , "Great reception" , "Wild applause" , "Enthuiastic applause, often standing" , "Enthusiastic applause and cheers" .)