Maybe count on getting back lost fluid shortly (5)
I believe the answer is:
noble
'maybe count' is the definition.
(I've seen this before)
'on getting back lost fluid shortly' is the wordplay.
'getting back' says the letters should be written in reverse.
'lost fluid shortly' becomes 'ble' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' in reverse letter order is 'no'.
'no'+'ble'='NOBLE'
Can you help me to learn more?
(Other definitions for noble that I've seen before include "Honourable or of high rank" , "Person of high rank" , "Impressive in appearance" , "Imposing, magnificent" , "old British coin" .)