Crossword Genius

Possibly infallible start, in the end (5)

Ross

I believe the answer is:

final

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

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

'possibly infallible start in' is the wordplay.
I cannot quite see how this works, but
'in' is within the answer.
The remaining letters 'fal' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for final that I've seen before include "big match" , "Not to be altered" , "Like one's journey to cemetery" , "Last match in a competition" , "Last in a series of games or contests" .)

I've seen this clue in the Evening Standard.
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