Crossword Genius

Boss of many a plant (6)

Ross

I believe the answer is:

master

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

'boss' is the definition.
(I know that master is a type of ruler)

'many a plant' is the wordplay.
'many a' becomes 'm' (this might be a standard abbreviation I've not previously seen).
'plant' becomes 'aster' (aster is a kind of plant).
'm'+'aster'='MASTER'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for master that I've seen before include "An old one is a great European painter" , "The boss" , "One has consummate skill" , "Teacher to gain control" , "Instructor" .)

I've seen this clue in the Evening Standard.
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