Fowl transfixed by male's tail that's lovely? (6)

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

On the one hand, a CD depicting a peahen bowled over by her mate’s wonderful tail. On the other hand, it is A HE (a male) in PEN, a female swan, a waterfowl and therefore a paid-up member of the fowl clade. The full ramifications of this clue took a while to dawn on me but now they have, I love it. On edit: It can be the PEN, with (mal)E + AH! (that’s lovely) in it.. that makes it a full &lit, so seems a better parsing than that above.. thanks to those commenting