§28

Wittgenstein distinguishes ostensive definition from ostensive explanation (§§27-28). Ostensive definitions can be variously interpreted.

Ostensive explanation is the correlate of asking something's name (§27).

We could explain the meaning of a word by pointing to something that is not the thing in question (e.g. we could point to an arrogant person and say 'that person is not modest' - where what we want to explain is the meaning of the word 'modest'). There is the possibility of the explanation going awry here - but that is possible in other kinds of cases too.

--Having said that he makes a distinction here I have to say I'm not clear what the distinction amounts to.