Poet's name Roma got wrong (4)

I believe the answer is:

omar

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

'poet's' is the definition.
(I've seen this in another clue)

'name roma got wrong' is the wordplay.
'roma' can be anagrammed to 'OMAR'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for omar that I've seen before include "- Khayyam, Persian poet, astronomer and mathematician" , "- - Sharif (films)" , "Arab" , "- Khayyam, Pers. poet" , "and 16 Down: Persian poet" .)

I've seen this clue in the Evening Standard.

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