Crossword Genius

Goblin has time to tumble (5)

Ross

I believe the answer is:

troll

I'm a little stuck... Click here to teach me more about this clue!

'goblin' is the definition.
(I've seen this before)

'time to tumble' is the wordplay.
'time' becomes 't' (abbreviation).
'to tumble' becomes 'roll' (I can't justify this - if you can you should believe this answer much more).
't'+'roll'='TROLL'

'has' is the link.

Can you help me to learn more?

(Other definitions for troll that I've seen before include "Fish - gnome - sing" , "Bad fairy (giant or dwarf)" , "Legendary Norwegian dwarf (or giant)" , "Try to catch fish" , "Supernatural cave-dweller" .)

I've seen this clue in the Sydney Morning Herald.
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