Very wrong to drink drop of Glenfiddich, a couple of fingers (1-4)

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

V (very) + SIN (wrong) round (to drink) G[lenfiddich] – and my husband would often use ‘two fingers’ to define a rough measure of Glenfiddich, one of his favourite malt whiskies