What does the cryptic crossword clue "Getting pickled gherkins, if a riverside denizen (10)" mean?

The wordplay uses an anagram. anagram of GHERKINS, + IF = KINGFISHER The answer is KINGFISHER.

Getting pickled gherkins, if a riverside denizen (10)

Guardian Cryptic #22468 | 12 Down | 2002-03-15 flower