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 they are linked in a way I don't understand?

'dad cycling along' is the wordplay.
I cannot really see how this works, but
an anagram of 'dad' is 'add' which is located in the answer.
The remaining letters 'up' 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 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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