Shame to keep case of Glenfarclas in farm outbuilding (6)

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

PITY (shame = a matter for regret, as in “it’s a pity” or “it’s a shame”) containing (to keep) the outer letters (case) of G [lenfarcla] S . (A Speyside malt whisky, though we don’t need to know that for the clue.)