Mark maybe stateside less (5)
I believe the answer is:
minus
'less' is the definition.
(both can mean take away)
'mark maybe stateside' is the wordplay.
'mark maybe' becomes 'min' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'stateside' becomes 'US' (short for United States).
'min'+'us'='MINUS'
Can you help me to learn more?
(Other definitions for minus that I've seen before include "Disadvantage" , "deficiency" , "Lacking; below zero" , "Lacking; negative" , "Less, without" .)