Lump raised above me is rounded mass (5)
I believe the answer is:
bolus
'rounded mass' is the definition.
(I've seen this before)
'lump raised above me' is the wordplay.
'lump' becomes 'lob' (I can't justify this - if you can you should give a lot more credence to this answer).
'raised' says the letters should be written in reverse (going up in a down clue).
'above' is a charade indicator (letters next to each other) (in a down clue, some letters go above others).
'me' becomes 'us' ('us' can mean 'me' in some dialects).
'lob' in reverse letter order is 'bol'.
'bol'+'us'='BOLUS'
'is' is the link.
Can you help me to learn more?
(Other definitions for bolus that I've seen before include "Rounded mass" , "Large pill" , "The ball" .)