Crossword Genius

Former leader in Tehran has worked hard (4)

Ross

I believe the answer is:

shah

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

'former leader in tehran' is the definition.
I can't judge whether this definition defines the answer.

'has worked hard' is the wordplay.
'worked' indicates an anagram.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'has' anagrammed gives 'sha'.
'sha'+'h'='SHAH'

Can you help me to learn more?

(Other definitions for shah that I've seen before include "Former Persian ruler" , "Old Middle Eastern ruler" , "Persian emperor" , "Iranian emperor" , "Former hereditary monarch of Iran" .)

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