Stand in centre, roughly on left (7)
I believe the answer is:
'stand' is the definition.
(I know that lectern is a type of stand)
'centre roughly on left' is the wordplay.
'roughly' indicates an anagram.
'on' is an insertion indicator (as in clothing 'on' a person).
'left' becomes 'l' (common abbreviation).
'centre' anagrammed gives 'ectern'.
'ectern' placed around 'l' is 'LECTERN'.
'in' acts as a link.
(Other definitions for lectern that I've seen before include "Speaker's stand" , "Slanted stand for a book" , "Support for bible in church" , "Church reading desk" , "Reader's stand" .)