More than ten initially seen in public (5)
I believe the answer is:
overt
'in public' is the definition.
(I've seen this before)
'more than ten initially' is the wordplay.
'more than' becomes 'over' (I've seen this before).
'initially' says to take the initial letters.
The initial letter of 'ten' is 't'.
'over'+'t'='OVERT'
'seen' acts as a link.
(Other definitions for overt that I've seen before include "Voter (anag.)" , "Not locked away" , "Conspicuous" , "Plainly apparent" , "Plain to see - manifest" .)