These days journalists mostly fill a marquee (2,7)
I believe the answer is:
at present
'these days' is the definition.
(I've seen this before)
'journalists mostly fill a marquee' is the wordplay.
'journalists' becomes 'press' (I've seen this before).
'mostly' means to remove the last letter.
'fill' means one lot of letters goes inside another.
'marquee' becomes 'tent' (I've seen this before).
'press' with its final letter taken off is 'pres'.
'a'+'tent'='atent'
'pres' placed within 'atent' is 'AT PRESENT'.
(Other definitions for at present that I've seen before include "temporarily" , "Nowadays" , "these days" , "As of now, during this time" , "Currently, right now" .)