Crossword Genius

Commanding officer's lettuce (3)

Ross

I believe the answer is:

cos

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

This could be a double definition.

'commanding officer's' is the first definition.
'co's' can be an answer for 'officer's' (Commanding Officer abbreviation). I am not certain of the 'commanding' bit.

'lettuce' is the second definition.
(cos is a kind of lettuce)

Can you help me to learn more?

(Other definitions for cos that I've seen before include "Greek island and type of lettuce" , "A long-leaved lettuce" , "Lettuce with long crisp leaves" , "Salad ingredient" , "Chief of Staff" .)

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