One has somebody calling round? More like a scammer! (7)
I believe the answer is:
phonier
'one has somebody calling round?' is the definition.
I can't judge whether this definition defines the answer.
'more like a scammer' is the wordplay.
I cannot quite see how this works, but
'more like' could be 'ier' ('y' can be similar in meaning to 'like') and 'ier' is found within the answer.
The remaining letters 'phon' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for phonier that I've seen before include "More affected" , "Less genuine" .)