Such an officer is no major (5)

I believe the answer is:

petty

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'such an officer' is the definition.
'petty' can be an answer for 'officer' (petty officer is a kind of officer). I'm not certain of the 'such an' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for petty that I've seen before include "Marked by narrowness of mind" , "Trifling" , "Unimportant" , "Insignificant or trivial" , "This cash is of a trivial amount" .)

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