Greek character observed pulling back trigger (8)

I believe the answer is:

detonate

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

'greek character observed pulling back' is the wordplay.
'greek character' becomes 'eta' (letter from the Greek alphabet).
'observed pulling' becomes 'noted' (I am not sure about this - if you are sure you should believe this answer much more).
'back' is a reversal indicator.
'eta'+'noted'='etanoted'
'etanoted' in reverse letter order is 'DETONATE'.

Can you help me to learn more?

(Other definitions for detonate that I've seen before include "Cause to explode" , "Set off explosive device" , "Start 15 [EXPLOSION]" , "let off" , "Trigger" .)

I've seen this clue in The Sun.

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