Crossword Genius

In Greece a dominant male? (5)

Ross

I believe the answer is:

alpha

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

'dominant male?' is the definition.
(I've seen this in another clue)

'in greece a' is the wordplay.
'in greece' becomes 'alph' (I can't explain this - if you can you should believe this answer much more).
'alph'+'a'='ALPHA'

Can you help me to learn more?

(Other definitions for alpha that I've seen before include "star of utmost brilliance" , "First in order of importance (for a Greek?)" , "starter" , "Top grade" , "Foreign character" .)

I've seen this clue in The Sun.
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