Crossword Genius

Practitioner needing to perform with a clear head (3)

Ross

I believe the answer is:

doc

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

'practitioner' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'to perform with a clear head' is the wordplay.
'to perform' becomes 'do' ('do' can be a synonym of 'perform').
'with' says to put letters next to each other.
'head' says to take the initial letters.
The first letter of 'clear' is 'c'.
'do'+'c'='DOC'

'needing' acts as a link.

Can you help me to learn more?

(Other definitions for doc that I've seen before include "Medic, in short" , "Physician (colloq.)" , "Fox perhaps" , "bones" , "Medic (familiar)" .)

I've seen this clue in the Evening Standard.
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