Crossword Genius

See how fast father is! (4)

Ross

I believe the answer is:

time

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'see' is the definition.
The answer and definition can be both related to thinking as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

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(Other definitions for time that I've seen before include "It's measured by watch or clock" , "Continuum of past, present and future" , "Spell" , "Duration; tempo" , "Prison sentence; occasion" .)

I've seen this clue in the Evening Standard.
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