Rampant Rand perhaps initially excited singer (4)
I believe the answer is:
enya
'excited singer' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'rampant rand perhaps initially' is the wordplay.
'rampant' is a reversal indicator (rampant can mean rearing).
'rand' becomes 'ayn' (I've seen this in another clue).
'perhaps' becomes 'e' (I can't justify this - if you can you should give a lot more credence to this answer).
'initially' means one lot of letters go next to another.
'ayn' back-to-front is 'nya'.
'nya' after 'e' is 'ENYA'.
Can you help me to learn more?
(Another definition for enya that I've seen is " Irish female singer".)