Each titular head needs to do so (3)

I believe the answer is:

eat

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'to do so' is the definition.
I can't tell whether this defines the answer.

'each titular head' is the wordplay.
'each' becomes 'ea' (abbreviation).
'head' says to take the initial letters.
The first letter of 'titular' is 't'.
'ea'+'t'='EAT'

'needs' acts as a link.

Can you help me to learn more?

(Other definitions for eat that I've seen before include "Gobble up" , "Devour" , "get stuck in" , "Do cats - bats? Do bats - cats? (Alice in Wonderland)" , "Break bread" .)

I've seen this clue in the Evening Standard.

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