Ten volunteers mean very little! (4)

I believe the answer is:

iota

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'very little' is the definition.
'iota' can be an answer for 'little' (thesaurus). I'm not sure about the 'very' bit.

'ten volunteers' is the wordplay.
'ten' becomes 'io'.
'volunteers' becomes 'ta' (abbreviation for Territorial Army).
'io'+'ta'='IOTA'

'mean' is the link.

Can you help me to learn more?

(Other definitions for iota that I've seen before include "Greek letter - minimal amount" , "Tiny bit" , "Just a jot, from Greek alphabet" , "Foreign character" , "Gk. letter; tiny amount" .)

I've seen this clue in the Evening Standard.

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