They sketch, maybe, putting Queen in at first with son (7)
I believe the answer is:
artists
'they sketch maybe' is the definition.
(artists might do sketches)
'queen in at first with son' is the wordplay.
'queen' becomes 'r' (abbreviation for regina, e.g. in ER ).
'in' is an insertion indicator.
'first with' becomes 'ist' (I can't justify this - if you can you should believe this answer much more).
'son' becomes 's' (genealogical abbreviation for son).
'r' put within 'at' is 'art'.
'art'+'ist'+'s'='ARTISTS'
'putting' acts as a link.
Can you help me to learn more?
(Other definitions for artists that I've seen before include "Monet and Manet, for example" , "Painters" , "Creative people" , "music performers?" , "They imagine" .)