Possible Clues:

• Gloat about guards before getting intimate
• Later, slightly confused, say nothing for close friend
• One virtually geocryptic
• Trusted friend's to modify construction kit student rejected
• Secondary identity ... or what can be found in 18-, 27-, 40-, 54- and 66-Across
• Clark Kent, to Superman
• Revise, for example, love for Bruce Wayne's other half
• Mr Hyde, for Dr Jekyll, played Gate role
• GEO?
• Funny Leo, great friend to be trusted