Crossword Genius

Drop a little lower keeping length in mind (5)

Ross

I believe the answer is:

calve

'drop a little lower' is the definition.
(a calve is a lower, something which 'lows')

I don't understand the remainder of the clue.

(Other definitions for calve that I've seen before include "Give birth (to whales or icebergs)" , "Bear on farm" , "Give birth (eg to elephant)" , "Bring forth a baby cow!" , "bear on ranch" .)

I've seen this clue in The Times and The Independent.
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