Related Clues:

• Speculative, not based on fact
• Assumed to be correct for particular purpose
• Not based on fact
• Assumed to be correct for particular purpose, say estimate
• Hypothetical, assumed to be correct
• Only place where some ideas look good
• There's not an island left that's not based on fact
• Theoretically practical 8, perhaps
• Imaginary - in on a lot (anag)
• As written — in theory
• Other than a lion — perhaps something less concrete
• Exists up to a point but not beyond it
• No going back for The Irish Times? Looks good in print
• Running an exam in theory
• Anything but an island, lake is imaginary