Corny as Lancashire, perhaps? (6)
I believe the answer is:
cheesy
'corny' is the definition.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for cheesy that I've seen before include "like others on the board?" , "Insincerely emotional -- like cheddar?" , "broad?" , "Like Cheshire (Cat's grin?)" , "showing poor taste" .)