One in charge of light drinker pocketing £1000 (7)

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

SIPPER (light drinker) containing [pocketing] K (£1000). Another that presented parsing problems as I was considering ‘one in charge of light’ as the definition and wondering if ‘light’ might be a type of boat like a ‘lighter’.