Crossword Genius

Fit dad cycling along (3,2)

Ross

I believe the answer is:

add up

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

'fit' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

'dad cycling along' is the wordplay.
I cannot really understand how this works, but
an anagram of 'dad' is 'add' which is present in the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for add up that I've seen before include "Point to a reasonable conclusion" , "Sum - make sense" , "Aggregate, get total" , "Total; make sense" , "Put together (numbers)" .)

I've seen this clue in The Times.
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