To put together to make a total (3,2)

I believe the answer is:

tot up

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

'total' is the definition.
(synonyms)

'to put together to make a' is the wordplay.
'to put' anagrams to 'TOT UP'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for tot up that I've seen before include "Summate" , "Sum - total" , "Determine the sum of" , "Do summer job" , "Tally" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.