Person drawing small sailing vessel with hesitation (8)

I believe the answer is:

sketcher

'person drawing' is the definition.

'small sailing vessel with hesitation' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'sailing vessel' becomes 'ketch' (ketch is a kind of sailing vessel).
'with' means one lot of letters go next to another.
'hesitation' becomes 'er' (sound made while hesitating - um, er).
's'+'ketch'+'er'='SKETCHER'

(Another definition for sketcher that I've seen is " Artist".)

I've seen this clue in The Times.

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