No more than (4)
'no more than' is the definition.
(eg a mere mortal is no more than a mortal)
This is the entire clue.
(Other definitions for mere that I've seen before include "Lake, pond (poetic)" , "Pool -- pure and simple" , "Nothing more than is specified - or a poetic lake" , "Nothing more than - water" , "Just an English lake" .)
'no more than' is the definition.
(eg 'only 10' means 'no more than 10')
This is all the clue.
(Other definitions for only that I've seen before include "Single, solitary" , "Except that; single" , "Unique; merely" , "Mere" , "See 6" .)
(Other definitions for upto that I've seen before include "As far as; ready for" , "Capable of; dependent on" , "Occupied with, engaged in (2.2)" , "Equal to or occupied with" , "Engaged in - no good?" .)