Possible Clues:

• Photoshop, say
• Medico
• Who perhaps has erected fake Dartmoor landmark?
• Who possibly could be caught breaking into house?
• Eg, surgeon
• Medical practitioner, for instance
• An apple a day keeps him away
• Cook up rubbish fish
• Might make you wellor, in turn, make the fish bad
• and 9 across, medical man in the mire