Most superficial son greeting old temptress Mae (10)

I believe the answer is:

shallowest

'most superficial' is the definition.
(shallow can mean superficial or vain)

'son greeting old temptress mae' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'greeting' becomes 'hallo' (alternative to hello).
'old temptress mae' becomes 'West' (actress and sex symbol Mae West).
's'+'hallo'+'west'='SHALLOWEST'

(Another definition for shallowest that I've seen is " Extremely thin".)

I've seen this clue in The Times.

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