Currently I'd say Clyne's strength is more on the defensive side (tho' that's no bad thing for a fullback IMO). His attacking play seemed to regress under Brendan Rodgers as we struggled to get our defence right and Clyne was pretty obviously under orders to play very conservatively. What I've seen of Clyne under Klopp has encouraged me though - I reckon Klopp can put the two sides of his game back together, in fact has already started to do so.
He's still the best RB in England IMO and proved it when he got a game in the Euros.