Animated cow lacking sign of hesitation to butt in (7)

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

(ERM)INTRUDE. Younger viewers and foreign correspondents might be rather perplexed by this reference to the much beloved cow in the children’s TV Series from the 60’s and 70’s, Magic Roundabout (though I see that there were some later revivals in various formats). In case you have all forgotten, Zebedee was the magic Jack-in-the-box; Dylan the rabbit; and Brian the snail. “Hello, dearhearts” was apparently Ermintrude’s catchphrase. Hopefully reasonably easy to biff for those not in the know.