i play 5 card draw on pokerstars
. this situation i would check, and discard 5 of clubs. pretty sure the villain has at least a pair or a draw, so he would call you anyways, considering its fixed limit.
now if you keep the pair of 5, you could discard 3, and see what the villain discards, if he discards 3, he probably has you beat with a bigger pair, if he discards 2, he probably has a pair and keeps a high card, like an Ace, many people do, now if he discards 1 card, and checks, he probably was on a draw and you can push him out by betting.
personally, when i get a big pair, i will bet before the discard round, but i would keep 3 cards, lets say i get a hand like KKA42, i would bet, and keep the AAK, see how many people call me, if i get 1 called that discards 3 cards, i will bet, if i get 1 called that discards 2, i might still bet, if i get a caller who discards 1, i will probably bet. but in this case, vs this villain, i would not make a move.