Permitted in felicitations (5)
I believe the answer is:
licit
'permitted' is the definition.
(I've seen this before)
'in felicitations' is the wordplay.
'in' says the answer is hidden in the clue.
'LICIT' is hidden in the letters of 'felicitations'.
(Other definitions for licit that I've seen before include "Within the law" , "Permitted by law" , "Not forbidden, lawful" , "Legal" , "in order" .)