The Wordsworth Crossword Companion

The Wordsworth Crossword Companion incorporates many special features:
Clear guidance on how to recognize and work out anagrams and how to decipher cryptic clues.
Thousands of synonym entries arranged in order of the number of letters in every word, e.g. fault n (3) bug; (4) flaw, lack, spot; (5) blame, error, taint, (6) defect; (7) absence, blemish, failing, frailty, mistake; (8) weakness; (10) deficiency, inadequacy; (11) shortcoming; (14) responsibility; over 30,000 synonyms.
Helpful introduction on the art of solving crosswords