So comical one is when saving (10)

I believe the answer is:

economical

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

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

'so comical one is' is the wordplay.
'comical one' anagrams to 'ECONOMICAL'.
But, I am unsure how the anagram is indicated.

'when' is the link.

Can you help me to learn more?

(Other definitions for economical that I've seen before include "Giving good value for money" , "Thrifty" , "Careful" , "Frugal" , "Providing good value" .)

I've seen this clue in The Irish News.

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