Crossword Genius

They only have walk-on parts, but they increase the cost (6)

Ross

I believe the answer is:

extras

I believe this is a double definition.

'they only have walk-on parts' is the first definition.
(as in film extras)

'they increase the cost' is the second definition.
(extra costs)

'but' acts as a link.

(Other definitions for extras that I've seen before include "Add-ons" , "Bit players in film" , "Spear-carriers" , "Bit players, actors without dialogue" , "5 [BYE BYE]" .)

I've seen this clue in The Times.
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