Stick at reflecting on heartache (6)

I believe the answer is:

attach

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'stick' is the definition.
(I know that stick is a more specific form of the action fasten)

'at reflecting on heartache' is the wordplay.
'reflecting on heartache' becomes 'tach' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'at'+'tach'='ATTACH'

Can you help me to learn more?

(Other definitions for attach that I've seen before include "Document carriers" , "Unite?" , "'Affix, fasten (6)'" , "Fix to something else" , "Join, connect" .)

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

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