Possible Clues:

• To a certain degree this could be a fishy way to behave
• Fishy way to behave, to a degree
• Ulterior motive
• Some inclination to fish
• Approach to problem no good, bitter about it
• Fish from the corner
• To a certain degree, a fishy way to behave
• Fish found by an early Englishman
• Point of view - 18 (anag)
• Corner of Welsh county - I agree to return having left