Girl reversing in limo anxiously (5)
I believe the answer is:
naomi
'girl' is the definition.
(girl's name)
'reversing in limo anxiously' is the wordplay.
'reversing' says the letters should be written backwards.
'in' says the answer is hidden in the clue.
'imoan' can be found hidden inside 'limo anxiously'.
'imoan' back-to-front is 'NAOMI'.
(Other definitions for naomi that I've seen before include "mother- in-law" , "Biblical character" , "woman's name" , "Biblical mother-in-law of Ruth" , "Girl's name, meaning "pleasant"" .)