Platform for a couple of fellows in lecture (8)
I believe the answer is:
scaffold
'platform' is the definition.
(scaffold is a kind of platform)
'a couple of fellows in lecture' is the wordplay.
'couple of' indicates the doubling of some letters.
'fellows' becomes 'f' (this might be a standard abbreviation I've not previously seen).
'in' means one lot of letters goes inside another.
'lecture' becomes 'scold'.
'f' doubled is 'ff'.
'a'+'ff'='aff'
'aff' inserted within 'scold' is 'SCAFFOLD'.
'for' is the link.
(Other definitions for scaffold that I've seen before include "sort of capital punishment!" , "1960s group?" , "Temporary framework" , "Framework formerly for executions" , "where many died" .)