Villain clickraises on NL25. What is our response?

[cbk86]

A situation I very often encounter while grinding NL25, is the position clickraise. An example:

Hero (100 BBs) is UTG with 99.
Villain (100 BBs) is in the CO.

Hero raises to 4x BB, fold to villain, who calls, and the rest of the table is folding.

The flop comes 47Q rainbow.
Hero bets 2/3 pot, villain minraises. What does this usually mean? I often encounter this against LAGish players who is about 22/10, and most often on dry boards with one or no overcards on the board, to my medium PP.

What is our response when we encounter such a move?

I tend to get very confused when this happens. How should a clickraise from a preflop caller be interpreted at NL25?

I mean, I've seen donks do this with nothing but A high, but also with overpairs and TPGK/TPTK. What do you think is the general tendency?

Cheers