Igor trained on piano, a Russian speciality (5)

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

At least the wordplay is clear enough: an anagram (trained) of IGOR tacked on to P[iano]. There are numerous variations in spelling, style and nationality of this fried bun (in Russia пирог). I’m more familiar with Polish pirogi, boiled savoury dumplings.