Checks long implement more than once (9)

I believe the answer is:

reinstall

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'implement more than once' is the definition.
I can't judge whether this definition defines the answer.

'checks long' is the wordplay.
'checks' becomes 'reins' (reining is a kind of checking).
'long' becomes 'tall' (I can't explain this - if you can you should believe this answer much more).
'reins'+'tall'='REINSTALL'

Can you help me to learn more?

(Other definitions for reinstall that I've seen before include "Again establish" , "begin program again" , "Replace" , "Put back in" .)

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

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