Well prehensions contains the HEN part of the clue (lady bird), mallyh, but I can't parse the rest of it. I also wondered about COMPREHENDS but can't explain that either.
Other words that may be the definition are:
PROBABILITY- but can't see any word play
ANTICIPATED -ant being a lady bug?)
PREMONITION -can't explain that except PEN is sort of in there)
FORECASTING - F for female+ sounds like AUK + a sting (gives you a spotted rash), but it seems like the tense requires 'forecasted'
Is PEN ET RATION (rash on) worth another look?
A ladybird could be a LAYER (of eggs) but I can't see what the 11 letter word could be