Convey sheer ecstasy (9)
I believe the answer is:
transport
This clue could be a double definition.
'convey sheer' is the first definition.
'transport' can be an answer for 'convey' (I've seen this before). I'm not sure about the 'sheer' bit.
'ecstasy' is the second definition.
(synonyms)
Can you help me to learn more?
(Other definitions for transport that I've seen before include "cab, perhaps" , "troopship" , "Move something or someone over a distance" , "Coach, possibly" , "Carry and throw into ecstasy." .)