After short dash caught fish that’s come too close (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

A charade of EN (‘short dash’ – in printing, an en is a unit of width, and an en dash is a short one, but I think it is a bit of a stretch to define en as a short dash, unless perhaps it is a common usage among printers) plus C (‘caught’) plus ROACH (‘fish’).