Cry from a whale (7)

I believe the answer is:

blubber

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'cry from a whale' is the definition.
'blubber' can be an answer for 'cry' (I've seen this before). I'm not certain of the 'from a whale' bit.

'cry from' is the wordplay.
'cry' becomes 'blub' (I've seen this before).
'from' becomes 'ber' (I can't justify this - if you can you should give a lot more credence to this answer).
'blub'+'ber'='BLUBBER'

Can you help me to learn more?

(Other definitions for blubber that I've seen before include "Cry uncontrollably" , "Weep - whale fat" , "Your body's fat" , "Fat of sea mammals - cry" , "Sob loudly" .)

I've seen this clue in The Globe and Mail.

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