Crossword Genius

Dubious expression regularly mars riffs (2,2)


I believe the answer is:

as if

I'm a little stuck... Click here to teach me more about this clue!

'dubious expression' is the definition.
'as if' can be an answer for 'expression' (I have seen 'Expression of incredulity' mean 'as if' so perhaps 'expression' could also mean 'as if'). I am not sure about the 'dubious' bit.

'regularly mars riffs' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'marsriffs' are 'AS-IF'.

Can you help me to learn more?

(Other definitions for as if that I've seen before include "Unbelievable!" , "I very much doubt it!" , "Or though" , "Seemingly" , "Yeah right!" .)

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app