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Thanks for your quick replies.
25A - this clue is on the far left of the grid, so there's nothing physically to the left of the clue - still don't get this clue.
5D Mummy's boy raised detailed thought in work - O-EDI-PUS - still don't get why "detailed" is in the clue, plus if IDEA needs to be shortened to IDE, there's no word indicating this (unless "detailed" is meant to indicate that, although I don't see how that could be the case)
23D SEEDY - oh I get it - "seedy" referring to the bottom of a bird's cage covered in seeds, plus people often say to a pet bird "Who's a pretty boy then?". I groaned when I finally understood this clue!
As for the dictionary, thanks for the links to the online dicts, although I should have specified I meant installable electronic dicts that you install on your hard drive.