Term for online currency, such as pony? (5)
I believe the answer is:
equid
'pony?' is the definition.
(pony is a kind of equid)
'term for online currency such' is the wordplay.
'term for' indicates one should take the final letters (the letter which terminates the word).
'currency such' becomes 'quid' (I can't explain this - if you can you should give a lot more credence to this answer).
The last letter of 'online' is 'e'.
'e'+'quid'='EQUID'
'as' is the link.
(Other definitions for equid that I've seen before include "A pony, perhaps" , "An ass perhaps" , "A mammal of the horse family" , "could be an ass" .)