I regularly do the RT crossword but occasionally attempt the Cryptic in the "i", Usually it's after I've managed to produce an answer (a matter of days) that I understand where the clue's coming from!
There are two in i 4213 that cause me problems!
20 Across - "Perfectly catching mice regularly, that'll be me! (6)" - TOMCAT. Obviously there's "CAT" in there - but the rest of it?
4 Down - "Cricket sides, including English, going extra day initially - not much good at getting runs? (3-6)" - ONE-LEGGED. Typically, as I type, it comes to me!
I'd got the GED (initials) and E for English, now I see "On Leg". Not being a cricket fan (forgive me), this is the demarcation of the pitch? Which is which I know not.
Thanks in anticipation